Table 1 Particle size analysis of lignite cutting crushing under different rotational speeds.

From: Research on the mechanism of coal wall fragmentation and dust production characteristics in the perspective of differentiated discrete elements

Particle size

35 r/min

50 r/min

65 r/min

80 r/min

Cumulative mass percentage (%)

Cumulative mass percentage (%)

Cumulative mass percentage (%)

Cumulative mass percentage (%)

Below 75 μm

100

100

100

100

75 μm ~ 125 μm

99.54

99.48

99.43

99.42

125 μm ~ 200 μm

98.82

98.84

98.64

98.43

200 μm ~ 300 μm

97.59

97.1

97.22

96.54

300 μm ~ 1 mm

95.73

94.92

95.56

94.22

1 mm ~ 15 mm

91.02

88.93

91.2

89.36

Above 15 mm

58.5

53.99

43.6

40.47

Total mass (kg)

22.64

23.33

23.35

25.19

Roughness index CI

641.2

633.26

625.65

618.44

Dust mass Percentage (%)

0.46

0.52

0.58

0.67

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